The Florida senator has concluded that going after Trump would accomplish little, given that the businessman’s supporters are deeply committed and unlikely to swing Rubio’s way. Inciting a confrontation with Trump onstage would create drama but wouldn’t help the senator gain voters, something he badly needs as he looks for his first primary win. Instead, Rubio’s team has decided his best bet is to focus fire on Cruz….The only way to dislodge Trump, Rubio’s advisers say, is to turn it into a two-man race – meaning that they first need to get Cruz out of the way.

Trump is very, very good at domination. He's cowed every Republican into going soft on him. It looks like it's going to be up to the Democrats to fight him on the field on which the campaign is actually being fought.